Answer:
On May 12, 1846, the United States Senate voted 40 to 2 to go to war with Mexico. President James K. Polk had accused Mexican troops of having attacked Americans on U.S. soil, north of the Rio Grande. But Mexico claimed this land as its own territory and accused the American military of having invaded. The Treaty of Guadalupe Hidalgo was signed in 1848, the treaty allowed the United States to purchase California, Arizona, New Mexico, Texas, Nevada, Utah, and Colorado for fifteen million dollars, doubling the size of the United States, but also displacing millions of Mexican citizens in new American territory. Mexico also gave up all claims to Texas and recognized the Rio Grande as America's southern boundary.
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Answer:
The large land was isolated from much of the rest of the world by dry deserts to the north and west, the Pacific Ocean to the east, and impassable mountains to the south. That enable the Chinese to develop independently from other world civilizations.
It means they had highly advanced infrastructure for their time. It's worth noting that major cities like New York use very similar grid like patterns for their layout still today, in 2016.
The answer is B) allowed former slaves to testify in court against whites and to serve on juries
