It, indirectly, was, because it was the reason the country initially relied on decentralized citizen militias for defense in the first place. Many of the founders were worried that a standing federal army would be a tool of oppression, and wanted to keep most of the firepower distributed amongst the populace.
The system more or less worked until the Spanish American War, when the government realized that the militias need some sort of standard in order to integrate properly with the regular army when called up. This led to the creation of the National Guard in 1903. It was tightly integrated into the Army structure in 1933.
What arguably made the Amendment obsolete was the advance of technology. By the early 20th century conventional warfighting took too much firepower, support, and coordination for a loose citizen militia to conduct. At best they could form the core of an insurgent force, but the goal is always to not get to that point.
In theory, that insurgent force could work against a tyrannical federal government. In practice, even if most of the people with the civilian firepower weren't supporting the tyranny I'm not sure it would work out. Conducting an insurgency against a foreign occupier is a lot different than conducting one against a domestic oppressor.
The system more or less worked until the Spanish American War, when the government realized that the militias need some sort of standard in order to integrate properly with the regular army when called up. This led to the creation of the National Guard in 1903. It was tightly integrated into the Army structure in 1933.
What arguably made the Amendment obsolete was the advance of technology. By the early 20th century conventional warfighting took too much firepower, support, and coordination for a loose citizen militia to conduct. At best they could form the core of an insurgent force, but the goal is always to not get to that point.
In theory, that insurgent force could work against a tyrannical federal government. In practice, even if most of the people with the civilian firepower weren't supporting the tyranny I'm not sure it would work out. Conducting an insurgency against a foreign occupier is a lot different than conducting one against a domestic oppressor.