The fact that it ended is not in dispute. Your assertion that SDI caused the dissolution of the CCCP is what is being challenged.
I'll wait.
That train left the station 30 years ago.
So you admit there is no evidence to support the causal relationship between SDI and the collapse.of the Soviet Empire but lack the intellectual bravery to admit it. Behave as expected.
LOL
SDI was a lynchpin in Reagan’s Defense buildup. An important factor in the Reagan Doctrine—that America would come to the aid of freedom fighters to throw off Soviet tyranny. It ended the Brezhnev Doctrine, which claimed that all socialist countries would fight any effort to introduce capitalism on their turf.
Gorbachev with all of his attempts to save the Soviet Union finally understood the obvious: the Soviet Union was so far behind in the Arms Race it had no choice but to just go away.
The Soviets committed suicide in Afghanistan. They were done. SDI was seen as Reagan gearing up a first strike weapon and Soviet hawks wanted to respond in kind but those dumb fucks had blown up their globsl strategy and leverage in Afghanistan so they could nothing else but fold.
Fast forward thirty years and the President of Russia in dealing with USA has zero economic power, zero military power and yet is winning the ideological battle because his best asset for defeating the USA is the President of The USA.
Slowly but almost surely Putin is becoming the President ofva reconstituted Soviet Union.