They were searching for gold. Also at the time, people could get money for killing Native Americans.
Im not 100% sure but that should be the year that Texas joined the nation or the united states.
Sharecropping, agricultural depression, the widespread infestation of the boll weevil, and flooding also provided motives for African Americans to move into the Northern Cities. The lack of social opportunities from Jim Crow laws also motivated African Americans to migrate Northward.
The Mexican war led to the capture of Arizona, New Mexico, Texas, and a part of California. Hope this helps.
Black Tuesday hits Wall Street as investors trade 16,410,030 shares on the New York Stock Exchange in a single day. Billions of dollars were lost, wiping out thousands of investors, and stock tickers ran hours behind because the machinery could not handle the tremendous volume of trading.