Taxes Owed On Land Sold In A Foreign Country

[Danny N.]

I have a piece of land in another country that I paid $20,000 for in 1989, its currently worth give or take $300k based on other comps in the area. If I was to sell it and net lets say $275k. What would I owe in taxes here in the US? Im 68 years old and collect social security. Would it affect me negatively? Thank you