What has been a long-term effect of the panama canal?
it has largely decreased the us military presence in latin america
it has greatly improved the amount of fertile farmland in nearby areas.
it has become one of the most important trade routes in the world.
it has quickened the spread of diseases like malaria and yellow fever.

the answer is option a.

was a long, primarily nonviolent series of events to bring full civil rights and equality under the law to all americans. the era has had a lasting impact on united states society, in its tactics, the increased social and legal acceptance of civil rights, and in its exposure of the prevalence and cost of racism. in the south violence and fraud in southern elections from 1868 to 1876, which had reduced black voter turnout and enabled southern white democrats to regain power in state legislatures across the south

less available tax revenue

this basically means that when they get money from taxes wirth having a lower gdp they get less then what others have with a higher gdp