Which of the following describes the most important effect of the tank out on world war i?

The tank was first used at the little known Battle of Flers. It was then used with less success at the Battle of the Somme. Though the tank was highly unreliable – as one would expect from a new machine – it did a great deal to end the horrors of trench warfare and brought back some mobility to the Western Front.

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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.

6 units. ab and lo are congruent sides, and if ab= 6 units, then lo would be the same.