You are wrong; only two parties have a chance, Democrat or Republican. If neither candidate is any good then Americans have no choice. I should not have to tell you this.
And yet about 10 people run every election. They like your idiot parties in Europe are on the ballot.
Only two run for president in the USA. Anyone other than a single Republican or a single Democrat has no chance. It is fundamentally undemocratic. You mention Europe a lot but there is more democracy in the European Union because we have a proportional representative system where smaller parties can become part of coalition governments and run-off elections for presidents of member states for the most part. Ask any American and they will tell you that they had little choice in the last presidential election.