No, a Chilean citizen does need a visa to travel to the UK. You can check by yourself by going to http://www.ukvisas.gov.uk/en/
Yes, US citizens traveling to Chile for tourism or business purposes for up to 90 days need a visa.
Yes, US citizens need a visa to travel to Uzbekistan.
Yes, US citizens need a visa to travel to Kazakhstan.
Yes, US citizens need a visa to travel to Russia.
Yes, US citizens need a visa to travel to Uzbekistan.
Yes, US citizens need a visa to visit Argentina.
Yes, US citizens need a visa to visit Kazakhstan.
Yes, US citizens need a visa to travel to Saudi Arabia.
Yes US citizens need a visa.
Yes, US citizens need a visa to travel to Saudi Arabia.
Yes, US citizens need a visa to visit Saudi Arabia.
Yes, US citizens need a visa to visit South Africa.