The machines that have landed on Mars are:

1) Mars 2 - Soviet Union (November 1971)

2) Mars 3 - Soviet Union (December 1971)

3) Viking 1 - United States (July 1976)

4) Viking 2 - United States (September 1976)

5) Mars Pathfinder - United States (July 1997)

6) Mars Polar Lander - United States (December 1999)

7) Mars Odyssey - United States (October 2001)

8) Spirit - United States (January 2004)

9) Opportunity - United States (January 2004)

10) Phoenix - United States (May 2008)

11) Curiosity - United States (August 2012)

12) InSight - United States (November 2018)

13) Perseverance - United States (February 2021)