evidence: As of 2021, there were about 44 million more males than females in the global population. But that difference is expected to disappear as a result of several different demographic trends. [...] The countries with the biggest male-to-female ratios today are Qatar (266 males per 100 females), the United Arab Emirates (228) and Bahrain (164). In several Persian Gulf countries, these wide sex imbalances are primarily due to large immigrant populations of largely male temporary workers. For example, according to UN estimates, 79% of Qatar’s 2019 population was born elsewhere, and among the foreign-born population, 83% were male. [...] The United States has had more females than males since 1946, according to the U.S. Census Bureau. In 2021, the population sex ratio in the U.S. was 98 males per 100 females. By 2050, it is expected to be 99.