What problem did the addition of lands won from the Mexican-American War cause for the country

During world war 11 how did the policy of internment affect people of japanese descent in the united states

Why did students gather in tiananmen square on june 4, 1989? on june 4, 1989, students gathered in tiananmen square to mourn the death of the pro-reform leader

What from the columbian exchange had perhaps the biggest impact on the world?