The primary reason the Allies overcome the advantages the Axis powers held before the U.S. entered the war was the addition of the United States and its enormous industrial economic capabilities to the Allied side. The United States was able to generate a level of production of material and manpower that the Axis simply could not match. Also, the Allies were fortunate that, in 1942, the Axis suffered some major reversals on the battlefield. Specifically, the British defeated the Germans in North Africa at the Battle of El Alamein, the Russians won the Battle of Stalingrad (begun in 1942, and ended in 1943), and the Americans won the battle of Midway in the Pacific, smashing the Japanese carrier forces. These battlefield victories halted the Axis advance and allowed time for the economic superiority of the Allied nations to come to bear.
The allies entered the war in 1914; the US entered the war in 1917.
both the allies and axis forces were tired and had low morale. When the us entered the war, they had brought new supplies to the allies forces in Europe and boosted morale. The us troops were not tired and weary. They had high morale and boosted the allies fighting strength. This led to many victories for the allies and eventually the allies won the war
what nation that had signed a nonaggression pack with Germany eventually joined the allies
Fight in the trenches and try to break a stalemate and overcome the Germans stranglehold. Eventually the Allies overcame the Germans once the Americans built up their force and more technological advances reached the troops.
Canada
America remained isolated from the conflict until the UK asked for assistance. The US helped to fund the UK's war effort which pulled the US out of 'The Great Depression'. After this proved not to be enough, the US entered the war and eventually brought the Allies to victory.
The allies had a huge number of supplies and arms on their side when they entered World War II. They also had air supremacy which was one of the major turning points in the war.
More firepower
The north had more advantages, the south had more allies.
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The United States eventually joined the war on the side of the Allies - the main states in this alliance, apart from the USA, were Britain (and the Commonwealth), France (they were defeated and surrendered by the time the US entered) and the USSR.
French and Spanish allies