Adding a little easier to the higher answer - the main sex hormones are testosterone (in men) and estrogen (in women). The first hormone is a "builder" of muscle and strength, the second - only builds fat. For example, a man with low testosterone is easy to identify - narrow shoulders, tummy, wide hips. But this means that a woman cannot become stronger. Women have a lot of potential in terms of leg muscles (that's why fitness babies, sorry, brag about their fifth point, while men - their biceps). In fact, muscle strength depends on the strength of the tendons, and a woman can develop great strength if she trains the tendons. I have already answered a similar question, but I repeat - tendon training looks like, for example, exercising with an expander or stretching the chain / rubber / food and does not affect the size of muscle mass. But in any case, in order to become stronger, a woman needs to make much more effort than a man. And all because of our sex hormones.
No, well, seriously, ONE request in google. Do not care that he leads to Wikipedia, there are links to EIGHT scientific papers, which, yes, prove that women are ~ 40-50% weaker than men in their hands, and 30-40% in legs. The proportions are maintained even when adjusting for the ratio of muscle mass to body mass.
Men have more muscle fibers than women. Men convert more food into muscle mass and women into fat (which makes sense). Etc. What I will retell here, read it yourself, links to scientific papers are attached there: https://en.wikipedia.org/wiki/Sex_differences_in_human_physiology#Muscle_mass_and_strength