Which country invented gay people?

Gay people were not invented. There have always been gay and bisexual people, in every culture, since the dawn of humanity. Homosexuality is not a choice. It's something you're born with.

However, as the Wikipedia entry for the Greek island of Lesbos states: "The meaning of the Word 'lesbian' derives from the poems of Sappho, who was born in Lesbos. The poems contain powerful emotional content directed toward other women and have frequently been interpreted as expressing same-sex love. It is due to this association that Lesbos and especially the town of Eresos, her birthplace, are visited frequently by lesbian tourists."