What country first sent explorers to what is now the u. s.?

The Vikings of Norway are the first Europeans known to have visited North America (u.s.)

answer is b.shrapnel

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.