What did president roosevelt introduce to retirees?

What role did the sons of liberty have when the stamp act was passed

Brainliestttme : ) -what reforms were made in communist china?

What is the columbian exchange? o a. the changes that resulted from europeans settling in the new world b. the relationships that columbus and his men had with the natives they met o c. the ships that columbus bought with money from the king and queen of spain o d. the increase in the number of native american towns in the new world