For staking you need at least Tier 1, go to “My profile” > “Limits” and apply for Tier 1.
{List USA states that is fully supported} - Current 9/9/2019
Arkansas, Idaho, Illinois, Indiana, Kansas, Kentucky, Massachusetts, Michigan, Missouri, Montana, New Hampshire, New Jersey, Pennsylvania, Tennessee, Texas, Utah, Virginia, Wisconsin and Wyoming.
{Blocked List} - Current 9/9/2019
Afghanistan, Algeria, Bolivia, China, Cuba, Ecuador, Eritrea, Hong Kong, Indonesia, Iran, Ivory Coast, Kyrgyzstan, Japan, Lebanon, Libya, Morocco, Myanmar, Namibia, Nepal, North Korea, Pakistan, Somalia, South Korea, South Sudan, Syria, Ukraine, Venezuela, Vietnam, Yemen.