The issue of debt caused considerable hardship during the period of Confederation. Who did the government owe the most money to?

By the time of the onset of the American Revolution, Britain had attained the status of a military and economic superpower. The thirteen American colonies were one part of a global empire generated by the British in a series of colonial wars beginning in the late seventeenth century and continuing on to the mid eighteenth century. The British military establishment increased relentlessly in size during this period as it engaged in the Nine Years War (1688-97), the War of Spanish Succession (1702-13), the War of Austrian Succession (1739-48), and the Seven Years War (1756-63). These wars brought considerable additions to the British Empire. In North America alone the British victory in the Seven Years War resulted in France ceding to Britain all of its territory east of the Mississippi River as well as all of Canada and Spain surrendering its claim to Florida (Nester, 2000).

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may i ask what challenges?