Most HPV infections don't lead to cancer. But some types of genital HPV can cause cancer of the lower part of the uterus that connects to the vagina (cervix). Other types of cancers, including cancers of the anus, penis, vagina, vulva and back of the throat (oropharyngeal), have been linked to HPV infection.
USA has 50 states since 1959. The flag has 50 stars, one for each state. The District of Columbia is a federal district, not a state. Many lists include DC and Puerto Rico, which makes for 52 states and other jurisdictions.
The 20 Star Flag is available for purchase from my friends at U.S. Flag Depot, Inc. The 1818 Flag:Realizing that the addition of a new star and new stripe for each new State was impractical, Congress passed the Flag Act of 1818 which returned the flag design to 13 stripes and specified 20 stars for the 20 states.