This is a list of things I commonly hear brought up on the subject:

1. Economic opportunities: The United States is the world's largest economy, and it has a thriving business environment that attracts entrepreneurs and investors from all over the world. The country has a well-established legal system, access to capital, and a skilled workforce, making it an attractive destination for people looking to start businesses or pursue career opportunities. However, economic opportunities vary across different regions and demographics within the US.
2. Cultural diversity: The US is one of the most diverse countries in the world, with a population made up of people from many different ethnic, religious, and cultural backgrounds. This diversity has contributed to the country's vibrant and dynamic cultural landscape, and it has created opportunities for cross-cultural exchange and understanding. However, discrimination and inequality also persist in American society.

3. Quality education: The US has some of the best universities and educational institutions in the world, offering high-quality education and research opportunities. Many people from around the world come to the US to study or conduct research, and the US is a leader in many fields of science and technology. However, access to quality education can be limited and costly for some people, and education systems vary across different states.

4. Political freedoms: The US Constitution enshrines many fundamental rights and freedoms, including freedom of speech, religion, and the press. The US has a well-established system of checks and balances, and citizens can participate in the democratic process through voting and other forms of civic engagement. However, political polarization, partisan gridlock, and restrictions on certain individual freedoms have been points of contention in recent years.

5. Natural beauty and recreational activities: The US is home to diverse and stunning natural landscapes, ranging from majestic mountains and canyons to picturesque beaches and forests. The country offers many opportunities for outdoor recreational activities, such as hiking, camping, skiing, and surfing. However, access to natural areas can be limited in some areas due to regulations, cost, or distance.

It is worth noting that the quality of life in the US can vary widely based on factors such as income, location, race, gender, and access to healthcare, among others. Additionally, other countries around the world may offer different advantages and disadvantages depending on the specific needs and preferences of individuals.

I am not making the claim that other countries don't have things like natural beauty and political freedoms.