Well, in the case of immigration to the U.S. around 1776, then there was very little.
However, talking about citizens moving West in the U.S. in 1800 - 1850, you had a number of people move West after the Louisiana Purchase in 1803, specifically those who wanted to explore new land. Furthermore, in 1848, the California Gold Rush prompted many people to move West to California and the nearby areas to look for gold and "get rich".
Father Junipero Serra was responsible for the building of missions in California. He was responsible for the first 9 of the 21 missions. He started in San Diego in 1769, and finished at Mission San Buenaventura in 1782.
After 8 months in Virginia, only 38 of the original 104 were alive when the first supply ship arrived in January 1608.
Two methods used to control annual floods were Flood Control and Flood Relief.
