Plants were spread from one continent to another.
· animals and diseases were introduced to new areas.
· populations were destroyed by foreign contact.
· the process began in the late 15th century.
all of these are describing
a) the silk roads.
b) scientific discovery.
c) the columbian exchange.
d) circumnavigation of the world.

by 1890, the united states had by far the world's most productive economy. american industry produced twice as much as its closest competitor--britain. but the united states was not a great military or diplomatic power. its army numbered less than 30,000 troops, and its navy had only about 10,000 seamen. britain's army was five times the size of its american counterpart, and its navy was ten times bigger. the united states' military was small because the country was situated between two large oceans and was surrounded by weak or friendly nations. it faced no serious military threats and had little interest in asserting military power overseas.

architecture i think.

i hope this !

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.