Why do historians like eric foner emphasize the long-term significance of the civil war amendments (reconstruction amendments)?

a drastic rise in oil prices ended decades of postwar.

monopolies  came to the united states with the colonial administration. the large-scale public works needed to make the new world hospitable to old world immigrants required large companies to carry them out. these companies were granted exclusive contracts for these works by the colonial administrators. even after the american revolution, many of these colonial holdovers still functioned due to the contracts and land

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