The United States is not part of the World Health Organization now. It was a member for a long time. The US joined in 1948. This changes how the US works with other countries on health.
The US government was not happy. It said the WHO did not handle the COVID-19 problem well. So, the US stopped giving money to the WHO. It will also work with the WHO less.
US leaders said the WHO was not good. They thought it was not fair when the virus started. This is why they decided to leave. Countries need to work together for health problems.
The US helped the WHO for over 70 years. It gave money and helped health work. Now, the US will do its own health plans.
Many people are worried. They think this is bad for world health. The WHO needs money from countries. Without US help, the WHO may have problems. The future of world health is not clear.