Who sent the earliest known valentine and to whom was it sent?

The maya got water from which of the following sources?

Which course of action did president carter propose in order to solve this problem for the next generation? a. contract with foreign nations to build wind turbines b. reduce federal spending on solar cell energy research c. drill fewer offshore wells to conserve marine life d. develop alternative energy sources

How did roosevelt corollary and dollar diplomacy affect u.s. relations with other countries?