B he invented a new branch of mathamatics called geometry it could be used to calculate speed direction and position of moving bodies like the planets
Answer:
Disease. When the Spanish arrived, they brought with them smallpox. Smallpox spread among the indigenous people and crippled their ability to resist the Spanish. The disease devastated the Aztec people, greatly reducing their population and killing an estimated half of Tenochtitlan's inhabitants.
Explanation:
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Direct election of U.S. senators is your answer!
Think about that expression -- crossroads of culture. The early West was something of a plethora of human beings, with people of all breeds and flavors a) travelling, such as the Mormon (Latter-day Saint) pioneers, b) going for gold (Gold Rush), c) running a business, etc. Another factor to consider is that the pioneers (the Mormons) had their numbers bolstered by people from England, Ireland, Scotland, throughout the US and other places, in consequence of missionary efforts by the Latter-Day Saint Church, and in response to the call of their prophet to "gather to Zion." With that amalgamation of people it's not hard to see why, at least in the early settlements, it's called a "crossroads of culture," due to the hundreds of types of variety present. Of course, other immigrants and families moved to the west other than the Mormons. I don't mean to imply the Mormons were alone in their endeavor.
Answer:
C. Doubled the size of the country
Explanation:
The Louisiana Purchase was a massive land purchase in American History that doubled the size of the country.