What was the significance of fletcher vs peck?

The case of Fletcher v. Peck (1810) culminated in a landmark decision by the United States Supreme Court. For the first time ever, the Court ruled that a state law was unconstitutional. This was a radical judgment, not least because many Americans passionately believed that state law should take precedence over federal law. To them, Fletcher v. Peck was another example of a disturbing trend in public life, a move towards greater centralization of power in American government.
The case also established an important legal precedent in relation to the sanctity of contractual agreements. The Court held that, whatever the Georgia state legislature's admirable motives in invalidating the relevant contracts may have been, it did not have the constitutional authority to do so. Even though the contracts had been made by crooked individuals they were legally valid nonetheless and should be upheld. In its well-meaning efforts at tackling corruption, the Georgia state legislature was essentially seizing property without compensation, and that was clearly unconstitutional.
The Marshall Court, in keeping with its Federalist bias, was overwhelmingly partial to business interests as well as strengthening central government. Allowing private property rights to override state laws was a useful tool in enabling not just the growth of federal power but also facilitating the rapid expansion of the United States economy in the early nineteenth century and beyond.
https://constitutionallawreporter.com/2015/06/16/fletcher-v-peck-contract-clause/