The answer that you're seeking is, "Trains from different rail lines could use each other’s tracks." The standardization of rails allowed trains to use eachothers tracks and increase speed and efficieny in deliveries. Hope I helped!
American and Filipino troops retreated to Bataan.
U.S President James Polk offered to buy California and New Mexico before the mexican american war, but his offered was rejected by the Mexican government.
The USA is often said to have been a “melting pot.”
