As a result of the Columbian Exchange, the landscape of the Americas was significantly changed by the introduction of - Gold mining

Irrigation

New livestock

Terrace farming

Which of the following was as a provision of the chinese exclusion act that affected chinese immigrants who were already in the united states ? a. the act forced chinese to return to china . b .) the act prohibited chinese immigrants from becoming american citizens. c.) the act prohibited chinese immigrants from entering the united states. d.) the act prohibited chinese immigrants from forming chinatowns