The United States wanted to make sure that the European
countries will not attack the United States. The doctrine stated that the US
will remain neutral in any foreign affairs. If any European countries will try
to colonize the US, they will consider it as an attack and may declare war
against the country involved.
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The oil industry boom prompted by the discovery of the Spindletop field.
Answer:
enabled the American colonies to prosper by trading with non-British entities,
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