There are so many answers to this question that it's absurd. A narrower scope would be helpful.
That said, we share a common root language. We also share a fairly similar belief system. We're all products of the Enlightenment. We're all rooted in democratic values and the liberal tradition.
Among other things, of course. In a broad sense however, these things pop to mind first.
They were discovered by spanish explorers
They were discovered by spanish explorers
French Guiana
they all were discovered by french explorers all but the US was discovered by french explorers...
They were all colonized by France
They all have a language spoken there.
they all were discovered by french explorers all but the US was discovered by french explorers...
South America
Guiana, Dutch Guiana and French Guiana
The three countries are: Guyana (ex British Guiana) Suriname ( Ex Dutch Guiana) and French Guiana (not independent).
Guyana, Suriname, and French Guiana are the countries formed from the Guiana Shield region in South America.
Guyana, French Guiana, Brazil