We could have built project Orion in the 70s to get to another star system in hundreds of years or less. There is no way we'd use chemical rockets, or even NER

We could have built project Orion in the 70s to get to another star system in hundreds of years or less. There is no way we'd use chemical rockets, or even NERVA type nuclear to go to another star system, there is simply no hope they'd even get there as anything other than dead hulks in thousands or tens of thousands of years.