True or False? It takes a short time for a river to form into an oxbow lake. True or False? A concave bank is the bank of a river with the great radius to a stream or river.

There have been Jewish communities in the United States since colonial times. Early Jewish communities were primarily Sephardi (Jews of Spanish and Portuguese descent), composed of immigrants from Brazil and merchants who settled in cities. Until the 1830s, the Jewish community of Charleston, South Carolina, was the largest in North America. In the late 1800s and the beginning of the 1900s, many Jewish immigrants left from various nations to enter the U.S. as part of the general rise of immigration movements. For example, many German Jews arrived in the middle of the 19th century, established clothing stores in towns across the country, formed Reform synagogues, and were active in banking in New York. Immigration of Eastern Yiddish-speaking Ashkenazi Jews, in 1880–1914, brought a large, poor, traditional element to New York City. They were Orthodox or Conservative in religion. They founded the Zionist movement in the United States, and were active supporters of the Socialist party and labor unions. Economically, they concentrated in the garment industry.

Refugees arrived from Europe after World War II and, after 1970, from the Soviet Union. Politically, American Jews have been especially active as part of the liberal New Deal coalition of the Democratic Party since the 1930s, although recently there is a conservative Republican element among the Orthodox. They have displayed high education levels, and high rates of upward social mobility. The Jewish communities in small towns have declined, with the population becoming increasingly concentrated in large metropolitan areas.