The reason why the roman empire divided in half during the 3rd century A.D is : C. To make it easier to administer
By that time, the roman empire already conquered a vast amount of territories it almost impossible to be administer by 1 central government alone
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The Panama Canal is so important to the US for trade. It greatly decreased the amount of time it took to travel between the Pacific Ocean and the Atlantic Ocean, thus causing an increase in commerce.
The Age of Exploration was the 15th-17th century where the European ships travel to different parts of the word to search for new trading route, wealth and knowledge.
Under the Articles of Confederation, the central government could:
1) Declare war on another country.
2) Raise an army.
3) Develop treaties with other countries.
4) Can allow new states to join the US with a 9/13 vote.
Besides the aforementioned responsibilities, the central government was very limited in what actions they can take. State governments could actually ignore the laws made by the central government if they felt they were unjust. This is one of the main reasons why the Articles of Confederation only lasts for about a decade in America.