Blacks
Maryland was not subject to Reconstruction, but the end of slavery meant heightened racial tensions as free blacks flocked to the city and many armed confrontations erupted between blacks and whites. Rural blacks who flocked to Baltimore created increased competition for skilled jobs and upset the prewar relationship between free blacks and whites. As black migrants were relegated to unskilled work or no work at all, violent strikes erupted. Denied entry into the regular state militia, armed blacks formed militias of their own. In the midst of this change, white Baltimoreans interpreted black discontent as disrespect for law and order, which justified police repression.
Baltimore had more blacks than any northern city. The new Maryland state constitution of 1864 ended slavery and provided for the education of all children, including blacks. The Baltimore Association for the Moral and Educational Improvement of the Colored People established schools for blacks that were taken over by the public school system, which then restricted education for blacks beginning in 1867 when Democrats regained control of the city. Establishing an unequal system that prepared white students for citizenship while using education to reinforce black subjugation, Baltimore's postwar school system exposed the contradictions of race, education, and republicanism in an age when African Americans struggled to realize the ostensible freedoms gained by emancipation.Thus blacks found themselves forced to support Jim Crow legislation and urged that the "colored schools" be staffed only with black teachers. From 1867 to 1900 black schools grew from 10 to 27 and enrollment from 901 to 9,383. The Mechanical and Industrial Association achieved success only in 1892 with the opening of the Colored Manual Training School. Black leaders were convinced by the Rev. William Alexander and his newspaper, the Afro American, that economic advancement and first-class citizenship depended on equal access to schools.

Economic growth
By 1880 manufacturing replaced trade and made the city a nationally important industrial center. The port continued to ship increasing amounts of grain, flour, tobacco, and raw cotton to Europe. However the new industries of men's clothing, canning, tin and sheet-iron ware products, foundry and machine shop products, cars, and tobacco manufacture had the largest labor force and largest product value.
The construction of new housing was a major factor in Baltimore's economy. Vill (1986) examines the activities of major builders between 1869 and 1896, especially as they gained access to building land and capital. Most, but not all, of the major builders were craftsmen who were entrepreneurs compared with others in the building trades, but were still small businessmen who built a relatively small number of houses during long careers. They worked closely with landowners, and both groups manipulated the city's leasehold system to their own advantage. Builders obtained credit from a diverse array of sources, including sellers of land, building societies, and land companies. The most important source was individual lenders, who lent money in small amounts either on their own account or through lawyers and trustees overseeing funds held in trust. In spite of their important role in shaping the city, the contractors were small businessmen who rarely achieved citywide visibility. Until the 1890s, Baltimore remained a patchwork of nationalities with white natives, Germans, Irish, and blacks scattered throughout the 'social quilt' in heterogeneous neighborhoods.

YWCA
Expanded economic activity brought many immigrants from the countryside and from Europe after the Civil War. Concerns for young, single Protestant women alone in cities led to the growth of the Young Women's Christian Association (YWCA) movement. Given the practice of segregation in Baltimore, however, two YWCA's emerged, the (white) Baltimore YWCA founded in 1883 and the Colored YWCA founded in 1896. They merged in 1920.