So given all that why did we use a uranium fuel cycle .... Simple, you can't build bombs with thorium. The sad thing is the uranium legacy was for nothing. After the DOD co-opted the DOE nuclear program and steered (forced ?) development away from Thorium and towards weapon friendly Uanium it become obvious that power reactors would never be able to produce the quantity of weapons grade material necessary. So we built dedicated "bomb reactors" optimized for the production of weapons grade plutonium. The rest of the world copied the US model since the R&D, designs, and expertise already existed and Thorium being theoretical and untested got sidelined for 60 years.
So, we don't have Thorium reactors today, because sociopathic closeted mass murderers saw no ability to use them to terrorize hundreds of millions of people with the threat of genocide.
Typical statist-religious bullshit.
Again, solar is going to get all the money now because it has had such a radical breakthrough in the last 3 years.