Big business is one economic factor that influenced US foreign policy. The business giants like J.P. Morgan put pressure on politicians to become more interventionist because they knew that this would encourage trade links with other countries. When the US finally did join world war one, trade with Britain increased by three times, and US big businessmen made a lot of money. The search for new markets meant the US would have to involve itself with the rest of the world. These new policies required military and naval support.
By the 1890 's, the USA was also such a world superpower that it would be very difficult for it to not get involved with world affairs - it had the power to intervene in foreign affairs, and so public pressure was very much on it to do so.
The strength of the American economy was soon exploited by Presidents and used in their foreign policy, for example Taft 's Dollar Diplomacy. He used loans and debts to effectively control the economies of other countries such as the Honduras in 1909. This would not have been possible if the US economy had not been as strong, and of course if other countries had not been in such economic turmoil.
Economic factors such as these were key in shaping US foreign policies between 1890 and 1917.
One of the key factors that influenced American foreign policy were the personal agendas of the presidents of the period. Other politicians in powerful positions also affected foreign policy, for example during the Boxer Rising in China in 1900. It led to foreign embassies in Beijing being besieged, and the US joined the international force that was formed with the intention of restoring peace and order in China. When it
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