I have to admit, there are times when I'm a little unsure whenever a Star Trek movie or TV show depicts the United States of America or the United Kingdom of Great Britain as still existing well into the future era the Trek shows occur in, when it also seems like most other current governments have been replaced by new ones. What makes so many writers so sure the USA and other Western governments will still be going strong in the 22nd, 23rd and 24th centuries?