Indian scholars invented all of the following that we use today except . a. the 12 month calendar c. the number zero b. inoculations against disease d. hindu-arabic numerals

the answer is A! believe me i just finished the test :)

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.