What was a major cause of the french revolution

There isn't one biggest cause for the French revolution, however major causes can be:

1. Political: French monarchy at the time considered themselves as 'representatives of gods' and had complete control over France. All kings before the French revolution (Louis XIV, XV and XVI) like unlimited power and arrested anyone they wanted to arrest. People were against that.

2. Social: France was a very miserable country during and before the French revolution, with society divided in three classes, the nobles, clerks and common people. Nobles and clerks had total authority and were the wealthiest. common people had to live in very bad conditions for their whole lives without anything to protect them from exploitation and poverty.

3. Economic: Due to past wars, France was in a huge debt. To reduce the increase in debt, France removed ministers, which only caused it to increase. As new ministers were appointed, the condition just worsened, with the debt increasing to nearly 1 billion Franks. The taxes caused lots of people from most classes to rebel, so the country could return to its great power. 

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.

he supported the seperation of church and state. he also promoted religious tolerance.