Final answer:
James II's actions in consolidating the New England colonies into the Dominion of New England created concerns due to his centralization of power and impact on colonial trade. The Dominion of New England represented the unified colony created by James II, while Spain was the first to establish colonies in the Americas.
Step-by-step explanation:
The concern that people in England and her colonies had about James II related to his attempts to create a more centralized control over the American colonies, exemplified by the creation of the Dominion of New England. This consolidation included former individual colonies like Massachusetts, New Hampshire, Plymouth, Connecticut, New Haven, and Rhode Island, later expanded to incorporate New York and New Jersey. This move threatened the autonomy of the New Englanders and disrupted trades based on smuggling, vital to the colonial economy.
The Dominion of New England was the consolidated New England colony that James II created, which represented a significant centralization of power and challenged the established colonial governance and commercial practices.
Spain was the first country to establish colonies in the Americas, significantly earlier than England's establishment of colonies during the era of Charles II.