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Bill Clinton, the first in this line-up, had a focus on domestic issues but was responsible for significant military actions, including the 1999 bombing of Serbia and NATO's enlargement.
George W. Bush, later, intensified military involvement with the wars in Iraq and Afghanistan, while also pushing NATO further toward including Ukraine and Georgia.
Moving to Barack Obama, who was initially celebrated for his Nobel Peace Prize, he paradoxically initiated military actions in Libya, invoked NATO in Syria, and supported the overthrow of the Ukrainian government.