landmark event that validated as legal mandatory segregation in public accommodations (particularly railroads) was Question 28 options: during the late 1880s, when southern states prohibited blacks from traveling in first-class railroad passenger cars and the laws were upheld in Plessy v. Ferguson in 1896. with the active support of President Lincoln during his first term in office. the rise of the Ku Klux Klan. the withdrawal of federal troops from the South in 1877.

landmark event that validated as legal mandatory segregation in public accommodations (particularly railroads) was Question 28 options: during the late 1880s, when southern states prohibited blacks from traveling in first-class railroad passenger cars and the laws were upheld in Plessy v. Ferguson in 1896. with the active support of President Lincoln during his first term in office. the rise of the Ku Klux Klan. the withdrawal of federal troops from the South in 1877.

	during the late 1880s, when southern states prohibited blacks from traveling in first-class railroad passenger cars and the laws were upheld in Plessy v. Ferguson in 1896.
	with the active support of President Lincoln during his first term in office.
	the rise of the Ku Klux Klan.
	the withdrawal of federal troops from the South in 1877.