it is generally assumed it was a singularity in time and space, which started to exist when and after the big bang. if you want, i can add some articles you may want to read!
There is not a specific antonym for diaspora, but the opposite of a diaspora would be the regrouping of a community or the coming together of a community. It could also be a renewal of a specific cultural group or ethnicity coming back together in a sort of revival of their culture.
Angkor Wat is a temple complex built in the Khmer Empire and is the largest religious monument in the world. It was built in the early 12th century and was first a Hindu temple and then a Buddhist temple. It was the capital of the Khmer Empire when King Suvayarman II ruled and made it his state temple and then eventually became his mausoleum. It is Cambodia's most visited site.
Benjamin Franklin was the one who did this.
