...is the number one event that has determined the course of Russian politics and culture, through the course of history. Rather than follow Europe and go with the Christian roots in so many Russian families, they have adapted to the Mongols primarily Asian form of government and culture.
C - Cold War (I need to add more since it needs to be 20 characters long)
Texas was annexed by the United States in 1845 and became the 28th state. Until 1836, Texas had been part of Mexico, but in that year a group of settlers from the United States who lived in Mexican Texas declared independence. ... The annexation of Texas contributed to the coming of the Mexican-American War (1846-1848)