Nike is the world's largest company in the footwear market and has the biggest market share in the USA.
Step-by-step explanation:
Nike has a mammoth share of 29% in the global market and has even greater of a monopoly in the USA for footwear markets.
This monopoly comes at the expense of its competitors like Adidas that are relegated to the global second in almost all spots by the Nike market share.
Nike has been worn more throughout history and its smart brand tactics have kept the market in the USA as alive as it was before and with constant demand for the shoes of all ranges.