When does the campaign for president end

An election for president of the United States happens every four years on the first Tuesday after the first Monday in November. The next presidential election will be November 3, 2020

Explanation:

zheng he was a chinese explorer who lead seven great voyages on behalf of the chinese emperor. his seven total voyages were diplomatic, military, and trading ventures, and lasted from 1405 – 1433. however, most historians agree their main purpose was to promote the glory of ming dynasty china.

explanation:

c) he felt the constitution clearly gave states this right.