<span>The history of immigration and emigration in the United States is closely linked to the history of railroads. Immigrants were not only integral to the construction of the transcontinental railroads that facilitated western expansion, but they also used the railroad to migrate west and to form new immigrant settlements in western states and territories.</span>
Answer: The answer should be c
Texas.
It was a separate country (after defeating Mexico and winning independence) for ten years before joining the US because it was broke and could sell off pieces of the country (now a state) to the US to pay off its debts.
It joined in 1845, four years before California.
