Its letter A .Philosophical research by Renaissance thinkers promoted the advancement of Greek ideologies on the formation of government
The reliance could be seen on how we acquire our military draft.
For example, countries such as Russia and south Korea implemented a mandatory military services for all adult men. (they're require to served at the military for around 1-2 years).
United states on the other hand, does not implement such mandatory military draft. All of our forces were acquired through voluntary methods without government force.
Since the nature of war has changed, voluntary method is more than enough since war that conducted on modern time would most likely relied on mass destruction weapons or advanced vehicles.
The legal challenges contribute to the decline of Reconstruction when President Lincoln announced that there is a plan for reconstructing the Confederate states which are already under the Union control. He proposed to excuse the Confederate who took a pledge to support the Union.
Segregation in the United States Armed Forces was required by Jim Crow laws.
The Jim Crow laws were state and local laws in the United States, promulgated by the white state legislatures, that at the time were dominated by the Democrats after the Reconstruction period between 1876 and 1965. These laws advocated the racial segregation in all public facilities by de jure mandate under the slogan "separate but equal" and applied to African-Americans and other non-white ethnic groups in the states of the United States. In reality, this led to treatment and accommodation being generally inferior to those insured for American whites, systematizing a number of economic, educational and social disadvantages. The de jure segregation was applied mainly in the southern United States. On the other hand, in the north, segregation was generally de facto predominantly towards blacks who lived in urban ghettos.
Some examples of Jim Crow laws were segregation in public schools, public places, public transportation and the segregation of bathrooms and restaurants; In addition, there were also sources of drinking water for whites and blacks. The US military was also segregated. The Jim Crow laws were derived from the black codes (1800-1866), which had also limited the civil rights and civil liberties of African-Americans.