The German American ethnic group (German: Deutschamerikaner) consists of Americans who have full or partial German ancestry. With an estimated size of approximately 46 million in 2014, German Americans are the largest of the ancestry groups reported by the US Census Bureau in its American Community Survey. The group accounts for about ?1/3 of the total ethnic German population in the world. None of the German states had American colonies. In the 1670s the first significant groups of German immigrants arrived in the British colonies, settling primarily in New York and Pennsylvania. Immigration continued in very large numbers during the 19th century, with eight million arrivals from Germany. In the middle half of the nineteenth century (between 1820 and 1870) over seven and a half million immigrants came to the United States — more than doubling the entire population of the country. By 2010, their population grew to 49.8 million citizens, reflecting a jump of 6 million people since 2000. There is a "German belt" that extends all the way across the United States, from eastern Pennsylvania to the Oregon coast. Pennsylvania has the largest population of German-Americans in the U.S. and is home to one of the groups original settlements, Germantown (Philadelphia), founded in 1683 and the birthplace of the American antislavery movement in 1688, as well as the revolutionary Battle of Germantown. The state of Pennsylvania has 3.5 million people of German ancestry.