When was the first Mikva built in the USA?

Question

When was the first Mikva built in the USA?

Answer 1

Don't know if this is the first one, but:

In the earliest days, the women of Shearith Israel made use of a natural spring near the synagogue for these ritual purposes. By 1759 Shearith Israel built a mikvah on its grounds, adjacent to the Mill Street synagogue.

(http://thehistorybox.com/ny_city/nycity_jewish_family_home_pt_II_article1298.htm)