Sol-Amari Saunders, right, 7, of Manhattan, joins a march and rally in honor of Dr. Martin Luther King Jr., Monday, Jan. 19, 2015 in New York. (Mary Altaffer)
A man holds up a picture of Dr. Martin Luther King Jr. during an annual march in honor of the civil rights leader in St. Louis. (Jeff Roberson)
People gather outside the Old Courthouse before before taking part in an annual march in honor of Dr. Martin Luther King Jr., Monday, Jan. 19, 2015, in St. Louis. (Jeff Roberson)
Savannah Perez, 13, of Manhattan, delivers a speech outside the Harlem Community Justice Center during a march and rally in honor of Dr. Martin Luther King Jr. (Mary Altaffer)
Youth hold up signs as part of a performance during the Martin Luther King Jr. holiday commemorative service at Ebenezer Baptist Church, the church where King preached in Atlanta. (David Goldman)
Actor David Oyelowo, who portrays the Rev. Martin Luther King Jr. in the movie "Selma," cries as he speaks during a service honoring King at Ebenezer Baptist Church. (AP Photo/David Goldman)
Homeland Security Secretary Jeh Johnson, left, participates in a wreath laying ceremony at the Martin Luther King, Jr. Memorial, on MLK Day, Monday, Jan. 19, 2015, in Washington. (AP Photo/Jacquelyn Martin)
A crowd listens to speakers at the annual King Day at the Dome rally as the Confederate flag flies on the grounds of the South Carolina Statehouse on Monday, Jan. 19, 2015. (AP Photo/Jeffrey Collins)
Dwayne Gilbert, center, of Philadelphia, marches to honor Rev. Martin Luther King Jr., Monday, Jan. 19, 2015, in Philadelphia. (AP Photo/Mel Evans)
Miriam Harris, left, of Baltimore, Md., shouts during a march to honor Rev. Martin Luther King Jr., Monday, Jan. 19, 2015, in Philadelphia. (Mel Evans)
Members of a group named "Suits in Solidarity" hold signs while marching during the 30th annual Kingdom Day Parade in Los Angeles on Monday, Jan. 19, 2015. (Richard Vogel)
People march during the 30th annual Marade honoring Rev. Martin Luther King Jr., Monday, Jan. 18, 2015, in Denver. (David Zalubowski)
Parades, rallies, prayer services and days of service were held around the United States to honor Dr. Martin Luther King, Jr., on January 19, 2015.