Upvote:3
Your question has several criteria:
- Country is invaded by a foreign power
- A "democratic" system is imposed upon the people who live there by the foreign power
- After the foreign power leaves a "democracy" remains.
Examples of this are legion. Here are a non-complete list of countries that experienced this:
- Canada
- India
- Pakistan
- Bangladesh
- Maylasia
- South Korea
- Botswana
- Mauritius
- Cape Verde
- Senegal
- Ghana
- Nigeria
- Sao Tome and Principe
- Namibia
- South Africa
- Benin
- Jamaica
- Germany
- Italy
There are probably a lot more. I put democracy in quotes because it's not really an objectively definable thing.