Pretty Americentric line of thought considering us dirty gaters have international "membership", but this also applies to the West in general.
Call it China or the Globalists -- 'and' is probably more appropriate, but there's been a deliberate decades long attack on our educational institutions, our government, our economy, the Christian religion, our borders, Communist infiltration of key positions in government and industry, etc. etc. etc.
And it's been so effective, I just don't see a reversal of course. Even if the moderate collective pulled the wool from their eyes and took action, we're still due for an economic implosion as the debt bubble eventually pops, and we'd have to deal with the indoctrinated masses who would violently resist being jacked out of the Matrix.
Personally, by this point I'm not even thinking about saving the republic, but rather what actions will need to be taken to build something better from its ruins.
To be honest, there was no possible way for Brexit to end any other way than peacefully. The entire European continent was purposely emasculated and rendered a permanent non-threat on the global scale militarily by the US after WWII. The only exception to this was France with their policy of "if any foreign power ever steps foot on our soil again, we are going to destroy the entire fucking world". But even then, France cucked out completely after de Gaulle's death. The military of virtually every Western European country was purposely designed to be absolutely incapable of direct offensive action without support from the US. This goes for every nation that subsequently joined NATO over the years as well.
The US was serious about permanently ending the possibility of war between European powers. As long as NATO exists, the European capacity for unilateral military action will be pretty much nonexistent. This is why I always laugh about the desire for some Europhiles to form a combined European military.