All of these factors helped to break stalemate: New Technology, The American entry into the war, the blockade of German ports and the German offensive in March 1918.How far do you agree with this statement?

All of these factors helped to break stalemate: New Technology, The American entry into the war, the blockade of German ports and the German offensive in March 1918.
How far do you agree with this statement?
Stalemate was on the western front for many years. It cost a lot of lives. It was finally broken however, in 1918. I will now examine each of the four factors that contributed to the breaking of stalemate to see if all of the above points did contribute to the breaking of stalemate, and see if I agree with the above statement.
New Technology
The tank was a main factor of new technology. The British invented the tank. When they were first invented they could travel at 6KM per hour and were armed with machine guns and cannons. It was first used at the Battle of the Somme (1916). The first time they were used they were not very manoeuvrable and very unreliable, they travelled at walking pace and it wasn’t until November 1917 at Cambria when the tank achieved success. The tanks in Cambria had caterpillar tracks copied from the farm tractor and with armour plating; the tank was the answer to the machine gun, the trench and barbed wire. There were only a few tanks in the Battle of the Somme and the element of surprise was wasted but the Germans didn’t copy the idea until it was too late. Attacks at Cambria with the 378 Mark IV tanks without a preliminary bombardment but with a creeping barrage was a great success. The outcome of this was a 5-mile advance towards the Hindenburg line and this created a 6-mile gap. Reinforcements were out of reach for the Germans. As the British reserves were in Italy this break though could not be exploited. The tank however showed its potential and achieved success. At the beginning of the war tank wasn’t as successful because it was so large and slow it was impossible to miss, but when the tanks were first used they brought with them a boost to morale for all the troops. However tanks sank into mud holes when it rained and they could not be pulled back out once they started to sink they were lost forever. Here is a quote from a British rifleman; he is talking of his sightings of the tanks in the first usage:

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In places, this response has detailed knowledge and a clear understanding of the key developments that led to the end of fighting on the Western Front. However, points could be linked more clearly back to the question, with more analysis and less narrative. 3 out of 5 stars.