The travels of marco polo focused on the exploration in which part of the world
asia
north america
south america
africa

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the navigation act prevented the colonies from exporting to countries other than britain and it prevented the importation of goods by other countries as well. so i believe the correct answer is d. other nations could not deliver goods to the colonies.

hope this .

c. troops marched forward in close formation against newer, more accurate weapons

a big one is

to appoint and regulate officers of the land and naval forces,

which caused much controversy ending the articles