What president recognized Cesar Chavez and Dolores Huerta? Explain what the president does for each one? Help is greatly appreciated :))

As a result of the columbian exchange, which crop was transferred to europe from the americas and later spread through the world? a coffee b maize (corn) c rice d olives e wheat

Poland a: nato b: warsaw pact c: not a member of either alliance

Why was the gulf of tonkin resolution important