How did sherman tanks give the allies an advantage over the axis powers?

Well, two reasons.

1. Shermans were the most mass-produced tank in WW2 and were able to fight on lots of fronts and have the numbers advantage.

2. Hitler underestimated allied tanks and was having mental breakdowns (from not having proper medicine treatment) that lead to poor decision making.

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explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.