he was said to have received a message from a angel
They were won in the Mexican-American war, alongside Texas. Texas gained recognition as a state of the United States while California and New Mexico became new states to be added to the Union as a result of the secession from the Mexican country. They were a result of the US wanting to go westward.
Euclid's Elements. It consists of 13 books. It was written in 300 BC.