Mexico has gun laws which are significantly more restrictive than the USA. There is only one legal gun store in the country, they must all be permitted, calibers are limited, and only permitted within the place of residence. "Monopoly on violence" is an illusion that's propped up mostly by the culture of the people who live in a country.
Sweden's gun homicide rate has increased by 400% since 2010 due to nothing other than demographic change.