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The Evangelical and Reformed Church (E&R), also referred to as the German Reformed Church, was a Protestant Christian denomination in the United States. It was formed in 1934 by the merger of the Reformed Church in the United States (RCUS) with the Evangelical Synod of North America (ESNA).  A minority within the RCUS remained out of the merger in order to continue the name Reformed Church in the United States. In 1957, the Evangelical and Reformed Church merged with the majority of the Congregational Christian Churches (CC) to form the United Church of Christ (UCC).
Both the Reformed Church and Evangelical Synod originated in the Protestant Reformation in Europe. Almost all their churches in America were established by immigrants from Germany and Switzerland. In 1934, both bodies united to form the Evangelical and Reformed Church.
The Reformed Church in the United States, long known as the German Reformed Church, organized its first synod in 1747 and adopted a constitution in 1793.  Later, in the 1910s, a small group of immigrant Hungarian Reformed congregations joined the RCUS as a separate judicatory, the Magyar Synod.
The Reformed tradition centered in the state of Pennsylvania, particularly the eastern and central counties of that state, and extended westward toward Ohio and Indiana and southward toward Maryland, Virginia, and North Carolina in the first generation of immigration. Early Reformed adherents settled alongside Lutheran, Schwarzenau Brethren/ German Baptists, and sometimes Anabaptist/ Mennonite neighbors. Some Reformed congregations in Pennsylvania and North Carolina formed union churches with Lutherans, sharing the same building but operating as separate entities, although they frequently shared Sunday Schools and occasionally ministers.
Up until the early 19th century, the Reformed churches ministered to German immigrants with a broadly Calvinist theology and plain liturgy. However, revivals, inspired by Anglo-Saxon Protestant churches during the Great Awakenings of the late 18th and early 19th centuries, influenced the development of the Reformed churches, especially in frontier regions. Some of the more radical practitioners of revivalism and/or pietism defected to Brethren bodies; still others formed the Churches of God, General Conference, a conservative, doctrinally Arminian group.
A backlash set in, however, against revivals in the form of the Mercersburg Theology movement. Named for the Pennsylvania town where the Reformed seminary was located in the mid-19th century, scholarly and ministerial advocates of this position sought to reclaim an older, European sense of the church as a holy society that understood itself as organically related to Christ. This implied a recovery of early Protestant liturgies and a renewed emphasis upon the rite of Holy Communion, somewhat akin to the Tractarian or Anglo-Catholic movement in Anglicanism but within a Reformation vein. Some leaders, however, saw this platform as an attempt to impose heretical Catholic practice and understandings in a Protestant setting. This group, centered in southeastern Pennsylvania in close proximity to a large Catholic population in Philadelphia and thus motivated by Anti-Catholicism, objected strenuously to the Mercersburg reforms, going so far as to establish a separate seminary now known as Ursinus College. After temporarily causing the Ohio Synod to withdraw from the church, tensions mounted until compromises were worked out and parishes of either low or high church persuasion were allowed to practice their preferences peacefully.
A later group of Germans who had come from the Russian empire, settling in the late 19th century, took root in Wisconsin and spread westward across the Great Plains region; this group spoke German for several generations after the Pennsylvania Dutch had thoroughly Americanized themselves, theologically as well as linguistically. These immigrants did not participate in the Mercersburg/Ursinus struggle; their theological persuasion was decidedly confessionalist, holding to a fairly strict intrepretation of the Heidelberg Catechism. So strong were the convictions of some that a few churches in that group, most of which were in South Dakota, defected immediately prior to the 1934 merger, influenced by such strict confessionalism, a belief in biblical inerrancy, and a fear of losing their Reformed roots. That group retained the name Reformed Church in the United States. 
This schism aside, by the time of the merger talks, the RCUS had mostly joined the American Protestant mainline, sending missionaries overseas and operating health and welfare institutions (i.e., hospitals, orphanages, nursing homes) throughout much of the United States. Further, the Reformed did some work among Native Americans in Wisconsin. The RCUS' constituency composed slightly over half of the membership of the new denomination in 1934.
The Evangelical Synod of North America (not to be confused with the Evangelical Church, later part of the Evangelical United Brethren Church) was founded in 1840 at Gravois Settlement, Missouri, by a union of Reformed and Lutheran Christians similar to the Prussia Union in the early 19th century.  In its early years it was known as the German Evangelical Church Association of the West.
As for the Evangelical tradition, its epicenter was (and is to this day, in the UCC) Saint Louis, Missouri, with a particularly heavy concentration of parishes within a 75-mile radius, in Missouri and Illinois. Elsewhere, Evangelicals tended to settle in large cities of the Midwest, such as Cincinnati, Louisville, Detroit, Milwaukee, and Chicago. Rural Evangelical strongholds included southwestern Indiana, southern Michigan and Iowa. In the Southern United States, the ESNA was found primarily in central Texas and New Orleans. These concentrations of German settlement also witnessed a large influx of more confessionally-oriented Lutherans, who formed the current-day Lutheran Church–Missouri Synod in opposition to the syncretism they believed the Evangelicals represented.
Although their faith was chiefly the product of a forced union by the government in Prussia, the Evangelicals by conviction wished to minimize the centuries-old points of contention between Lutheran and Reformed doctrine and practice. This attitude of moderation was enabled in large measure by the rise of pietism, which stressed a more emotional, less rationalistic approach to the teachings of the Bible, thus disinclining scholars and pastors toward technicalities or polemics. Many Evangelical parishes were founded by pastors trained in interdenominational missionary societies such as the St. Chrischona Pilgrim Mission in Basel, Switzerland in the early 19th century; they immigrated to the United States to assist settlers fleeing Prussian militarism.
Even to a greater degree than the Reformed, the Evangelicals became most noted among American Protestants for their establishment and staunch support of hospitals, orphanages, and homes for the elderly. Probably most similar in ethos (among English-speaking Protestant groups) to the Methodists, pastors emphasized pietist preaching and catechizing young people for the rite of confirmation, a rite still cherished highly to this day by congregations deriving from ESNA roots. Reflecting a later generation of immigration, the German language persisted for several generations in most congregations before such services were gradually phased out in the era between the World Wars, due in part to anti-German sentiment among some Americans. In 1919, they began missionary efforts in Honduras, establishing what is now called the Evangelical and Reformed Church in Honduras . 
In terms of governance, the Evangelicals most resembled American Lutheranism of the time, with high regard for the pastor's authority, but essentially congregational in structure, with a lay council handling temporal matters such as property and benevolences.
In 1957, the Evangelical and Reformed Church joined with the General Council of Congregational Christian Churches to form the UCC. The Rev. James Wagner was the last president of the denomination. Upon the union on June 25 of that year, he became, along with former Congregational Christian general minister Fred Hoskins, a co-president of the UCC. He and Hoskins held these positions until 1961, when the UCC constitution was ratified by the Evangelical and Reformed synods and the requisite percentage of CC congregations. About 40 percent of the members in the new denomination were members of the E&R Church.
The Evangelical and Reformed Church was generally presbyterian in organization,  although it allowed for a great deal of local congregational decision-making than more typical Reformed bodies such as Presbyterianism or the Reformed Church in America did. The church organized into some 30 or so regional synods, culminating in a national General Synod that met annually.
The church used several creeds: the Reformed Heidelberg Catechism, Martin Luther's catechisms, and the early Lutheran Augsburg Confession; Evangelical and Reformed leaders allowed great latitude in interpretation.  In the main, Evangelical and Reformed congregations emphasized piety and service rather than legalistic soteriology or orthodox dogma. Styles of worship ranged from revivalism (especially in Ohio and North Carolina) to a Lutheran-like liturgicism (the Mercersburg Movement found primarily in central Pennsylvania parishes). Generally speaking, the theological outlook of most ministers was largely accepting of liberal trends in Protestant doctrine and higher biblical criticism, although some pockets of conservative revivalistic pietism and confessionalist Calvinism could be found.
As with most Protestant denominations, the Evangelical and Reformed church maintained educational institutions and foreign missions. Affiliated educational institutions included the Lancaster Theological Seminary, Franklin and Marshall College, Cedar Crest College, and Ursinus College in Pennsylvania, Elmhurst College in Illinois, Hood College in Maryland, Catawba College in North Carolina Eden Theological Seminary in Missouri, and Heidelberg College in Ohio. An Evangelical and Reformed seminary, Mission House, previously located in Sheboygan, Wisconsin, joined with the school of theology of South Dakota's Yankton College (a Congregational Christian institution) to form the United Theological Seminary of the Twin Cities in the early 1960s. The seminary set up operations in New Brighton, Minnesota, outside St. Paul. In the early 1930s Central Seminary, a previous merger of Ursinus and Heidelberg Seminaries, was merged with Eden Seminary.
The list includes members of United Church of Christ congregations of Evangelical and Reformed heritage.
- Donald Bloesch
- Walter Brueggemann
- Leon Jaworski
- John Williamson Nevin
- Reinhold Niebuhr
- Richard Niebuhr
- Philip Schaff
- Richard Schweiker
- Bud Shuster
- Paul Tillich
- Friedrich Wilhelm von Steuben
- John Winebrenner
United States President Theodore Roosevelt attended Washington D.C.'s Grace Reformed Church, an Evangelical and Reformed congregation. Roosevelt originally belonged to the Reformed Church in America (RCA), a Dutch-American group. Since there were no RCA congregations in Washington, he chose Grace Reformed as perhaps the church most similar liturgically and theologically to Dutch Calvinism.
- A History of the Evangelical and Reformed Church, David Dunn, et al.; Lowell H. Zuck, foreword. New York: Pilgrim Press, 1990.
- The Shaping of the United Church of Christ: An Essay in the History of American Christianity, Louis H. Gunnemann; Charles Shelby Rooks, ed. Cleveland: United Church Press, 1999.
- Builders of Our Foundations - A History of the First Evangelical Church of the Synod, Henry Bode, D.D.; Webster Groves, Missouri: self-published, 1940