Ethan Allen and the Green Mountain Boys:a. fought intrusions by New York landlords into what became Vermont. b. were spies working for the Sons of Liberty. c. forced the British army to retreat at Concord. d. put down the revolt of the Regulators in North Carolina. e. started the colony of New Hampshire.

:a. fought intrusions by New York landlords into what became Vermont.

Explanation:

Ethan Allen and the Green Mountain Boys: fought intrusions by New York landlords into what became Vermont. The Green Mountain Boys formed by Ethan Allen were originally created to prevent New York authorities from controlling their land,their aim was to prevent the New Hampshire Grants , from becoming part of New York.

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the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.