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During the early twentieth century, what happened to the nation's century-long isolation from European conflicts?1. It ceased because the United States had long supported the Ottoman Empire rather than offering relief or resources to European countries such as Great Britain.2. It continued because changing demographics meant that the United States could not afford for many men to join the military, and women were banned from taking any jobs.3. It ended, in part because the interests of the United States became more bound up with the expanding world economy, and new war technology threatened national security.4. It was declared unconstitutional by the Supreme Court because the United States had been founded on the idea that it had obligations to protect all smaller nations.

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