The Rocky mountains provided the greatest obstacle to railroad expansion
This should be False
Sun Yat-Sen was an important figure in the collapse of the Imperial China in the way that he helped the nationalists establish the Republic of China in 1912 when the Qing dynasty lost its power. He was the first president and resigned after a while but the country was a democratic one while the parties existed during his time.
Congress is in the legislative branch, so the answer would be (a). hope this helps
