What diseases do you Native Americans contract from European explorers?

Numerous diseases were brought to the Americas, including smallpox, plague, chickenpox, cholera, the common cold, diphtheria, influenza, malaria,

Explanation:

all choices are correct

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.