The Mexican-American war opened up what is now the American Southwest (Arizona, New Mexico, etc) and most of California to American settlers. Following the end of the war in the mid-1800s, Mexico ceded huge swaths of land in the region which was then opened up to American settlers with California being the most popular destination.
Black death (bubonic plague) 1346-1353
In general, the Judicial system of the Roman Republic contributed to the democratic principles by how it provided a separation of powers
The answer is : <span>B energy crisis
Hope it helps </span>