But why other countries with as much money as America and the same amount of technology haven't even tried?
Common sense and critical thinking, plus a knowledge of history leads to the answer of money, and cost v benefit of coming second.
Bit of history:
The only players in the world with a heavy lift launcher capability in the late 60s were the USSR and the US.
The USSR heavy lift programme almost literally crashed and burned with the failure of an N1 launch around the same time as Apollo 11.
The Russians then saw the US land, and decided that they were strapped for cash and there was no benefit in pressing on with their Moon landing programme just to be second- the remnants of which can be seen in one or two Museums in Russia.
Next up was China - but they were not willing to go on a war footing to even put a man in space in a big hurry so the first Chinese launched Taikonaut didn't fly until 2003. The Chinese have however hinted at maybe a Moon programme.
If you want to believe in 6 moon landings in 1969, great for you. I don't.
I don't either, and I'm afraid the fact you seem think that is what happened demonstrates you maybe don't have the level of knowledge of this subject as perhaps you think you do..