the US was extremely late amongst developed countries to grant universal suffrage
I'll agree with you that the civil rights movement beginning in the 1960s was necessary for the United States to extend the benefits of freedom to all its citizens. But universal suffrage for women came significantly earlier in the United States than it did in Switzerland, for example, and black people in my state (Minnesota) have always been able to vote and to own property and to marry whomever of whatever race and so on since before Minnesota became a state (which, indeed, was one of the points of the Dred Scott case, in which a slave tried to become free by claiming that his passage through the free territory of Minnesota should end his condition of slavery). The Civil War was a necessary reaction to totalitarian denial of basic human rights by the Confederate states, and the civil rights movement after World War II was a necessary response to the deplorable segregation that still occurred in those states long after the Civil War, but everyone in some regions of the United States has long recognized that slavery and Jim Crow segregation were both aberrations, gone in some states from the beginning, and always contrary to the basic principles of the Declaration of Independence and the Bill of Rights (and the bills of rights in various state constitutions).
Yep, I didn't say it was the last democratic developed country to grant universal suffrage, because of Switzerland (or the one or two cantons that didn't let women vote).
I'll agree with you that the civil rights movement beginning in the 1960s was necessary for the United States to extend the benefits of freedom to all its citizens. But universal suffrage for women came significantly earlier in the United States than it did in Switzerland, for example, and black people in my state (Minnesota) have always been able to vote and to own property and to marry whomever of whatever race and so on since before Minnesota became a state (which, indeed, was one of the points of the Dred Scott case, in which a slave tried to become free by claiming that his passage through the free territory of Minnesota should end his condition of slavery). The Civil War was a necessary reaction to totalitarian denial of basic human rights by the Confederate states, and the civil rights movement after World War II was a necessary response to the deplorable segregation that still occurred in those states long after the Civil War, but everyone in some regions of the United States has long recognized that slavery and Jim Crow segregation were both aberrations, gone in some states from the beginning, and always contrary to the basic principles of the Declaration of Independence and the Bill of Rights (and the bills of rights in various state constitutions).