WASHINGTON (AP) — President Barack Obama is gathering nearly 50 African heads of state in Washington for an unprecedented summit aimed in part at building his legacy on a continent where his commitment has been questioned.

The gathering, beginning today, is to discuss Africa's regional security, democracy building and business investment. But recent world events are competing for Obama's attention, such as clashes in Gaza, Russia's provocations in Ukraine, mounting extremism in Iraq and an outbreak of the deadly Ebola virus in West Africa.

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