So, it looks like the New York Dutch in the form of Vanderbilt were in
Nicaragua before Walker.
http://library.advanced.org/17749/lwalker.html
Walker's supporters appropriated a transit company owned by the American
industrialist Cornelius Vanderbilt and Vanderbilt retaliated by financing
the Conservative forces against Walker. Walker was overthrown in a battle in
1857, and despite his attempts to recapture Nicaragua he never again
regained control. The British captured Walker in Honduras in 1860 during
another takeover attempt and he was promptly executed by the Honduran
authorities.
William Walker (Light) -- Experience Nicaragua.url
