I believe the answer is B
The passage of the Chinese Exclusion Act<span> came after a long period of anti-</span>Chinese <span>discrimination. ... The </span>Chinese Exclusion Act<span> of 1882 was one of the first pieces of legislation passed by the United </span>States<span> government to legally discriminate against the </span>Chinese<span> people.</span>
There were several immediate stated causes for the U.S. declaration of war: first, a series of trade restrictions, Orders in Council (1807), introduced by Britain to impede American trade with France, a country with which Britain was at war (the U.S. contested these restrictions as illegal under international law); second, the impressment (forced recruitment) of U.S. citizens into the Royal Navy; third, the British military support for American Indians who were offering armed resistance to the expansion of the American frontier to the Northwest. President James Madison and Congress declared what is sometimes referred to as the 2nd War of Independence, the War of 1812.
The political boundaries of the U.S changed from 1845 to 1853 by increasing the territory and getting land as far out as California because the Americans fought the Mexican American war (1846-1848) that resulted in Mexico yielding the area we know as the Mexican cession have a nice day (:
