Answer:
The anti-imperialists opposed the expansion because they believed imperialism violated the credo of republicanism, especially the need for "consent of the governed".
The modern development of today's world would have first made the routes safer. Today we have the safety of common things such as police officers, hospitals, e.t.c. Transportation of goods would have been easier, and it would have been easier to carry larger amounts of goods at one time.
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Those factors include philosophy, political systems, technology, trade, and military developments. When establishing an empire, desire for more resources, a better standard of living for its people and the desire for power among its leaders were big factors. But so were the philosophies of the people of a country.
