What has not been a problem facing el salvador in the early twenty-first century

the answer is: natural disaster

El-Savador is located in an area called the 'ring of fire'. This ring of fire exist on top of volcanoes, so the danger of earthquake and eruption always exist.

During the early twenty-first century, there was very little volcanic activity on the ring of fire, which is why el savador hasn't been facing any huge problem regarding natural disaster in early twenty-first century

states began imposing duties on each other's goods. congress had no way to raise money for an army to expel them.

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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