In the 1400s, european explorers benefited from
a. the availability of gps.
b. the development of time zones.
c. the use of steam ships.
d. improvements in map-making skills.

the court ruled that a state law that banned abortions (except to save the life of the mother) was unconstitutional

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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.