San Diego's Waterfront Park became the stage for a powerful demonstration of unity and activism, as approximately 1,000 people gathered to celebrate International Women's Day.

Amid Trump's second term, Women's March organizers across the U.S. are prompting people to unite with calls to action.

It is an official holiday in more than 20 countries, including Afghanistan, Burkina Faso, Ukraine, Russia and Cuba, the only one in the Americas.