The city with the best-selling houses in the United States is Dallas, Texas. Dallas has consistently ranked as one of the top markets for home sales due to a combination of factors that make it an attractive destination for buyers.

One of the primary reasons for Dallas's strong housing market is its robust economy. The city is home to a diverse range of industries, including energy, technology, and healthcare, which have contributed to a steady job growth and a high demand for housing. According to the Dallas Association of REALTORS, the city saw a 12.5% increase in home sales in 2021 compared to the previous year, with a total of 42,812 homes sold.

Another factor that has driven Dallas's housing market is its affordability. While home prices have been rising, they remain relatively lower compared to other major cities like San Francisco or New York. This affordability has made Dallas an attractive option for first-time homebuyers and those looking to upgrade their living situation. According to Zillow, the median home value in Dallas was $312,000 as of February 2023, which is significantly lower than the national median of $412,000.

Additionally, Dallas's strong population growth has played a significant role in its housing market. The city has been experiencing a population boom, with an estimated 1.3 million residents as of 2021. This growth has created a high demand for housing, further driving up sales. According to the U.S. Census Bureau, Dallas's population increased by 10.5% between 2010 and 2020, making it one of the fastest-growing cities in the country.

Furthermore, Dallas's quality of life and amenities have also contributed to its popularity. The city offers a wide range of cultural attractions, including museums, parks, and entertainment venues. It also boasts a strong public school system and a low crime rate, making it an ideal place to raise a family. These factors have made Dallas a desirable destination for both residents and investors.

In conclusion, Dallas, Texas, has the best-selling houses in the United States due to its strong economy, affordability, population growth, and quality of life. These factors have created a high demand for housing, driving up sales and making Dallas a top market for home buyers.