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Tens of thousands crowded into a packed Constitution Avenue in downtown Washington, D.C. during the March for Life, from near the Washington Monument to the U.S. Capitol building. (²ÝÝ®´«Ã½/Alejandro Alvarez)

A rallygoer at the 47th annual March for Life holds a sign. (²ÝÝ®´«Ã½/Kate Ryan)

An attendee of the 2020 March for Life holds an anti-abortion sign near the National Archives building in Washington, D.C. on Jan. 24, 2020. (²ÝÝ®´«Ã½/Alejandro Alvarez)

Along the route of the 47th annual March For Life, a group set this display up in front of the National Museum of American History. (²ÝÝ®´«Ã½/Kate Ryan)

Vaccine skeptics — activists who reject robust science in support of the health benefits of vaccines — gather outside the National Archives ahead of the March for Life in downtown Washington, D.C. on Jan. 24, 2020. (²ÝÝ®´«Ã½/Alejandro Alvarez)

Participants in the March for Life hold a speak-out in front of the U.S. Supreme Court building following a march down Constitution Avenue, featuring women who said they regretted their decision to carry out an abortion. (²ÝÝ®´«Ã½/Alejandro Alvarez)

March for Life attendees carry a sign at the 47th annual event. (²ÝÝ®´«Ã½/Kate Ryan)

Anti-abortion activists hold signs outside the U.S. Supreme Court building following the March for Life on Jan. 24. (²ÝÝ®´«Ã½/Alejandro Alvarez)

Supports of President Donald Trump attend the March for Life in downtown Washington, D.C. (²ÝÝ®´«Ã½/Alejandro Alvarez)

Anti-abortion activists hold signs outside the U.S. Supreme Court building following the March for Life on Jan. 24. (²ÝÝ®´«Ã½/Alejandro Alvarez)

An anti-abortion activist hold signs outside the U.S. Supreme Court building at the finish line for the annual March for Life. The 2020 march featured several youth groups who traveled to the D.C. event from across the country. (²ÝÝ®´«Ã½/Alejandro Alvarez)

Pro-abortion activists hold a counter-demonstration outside the Supreme Court as the March for Life passes. The annual March for Life consistently sees smaller counter-protests by abortion rights groups active in the D.C. region, including Planned Parenthood and the Feminist Majority Foundation. (²ÝÝ®´«Ã½/Alejandro Alvarez)

A man selling merchandise stands along the route of the 47th March for Life in downtown D.C. (²ÝÝ®´«Ã½/Kate Ryan)

An anti-abortion youth group sings and chants ahead of the March for Life near the National Archives. (²ÝÝ®´«Ã½/Alejandro Alvarez)

An anti-abortion youth group sings and chants ahead of the March for Life near the National Archives. (²ÝÝ®´«Ã½/Alejandro Alvarez)