who has the right to admit new states
Admission to the Union The Admission to the Union Clause of the United States Constitution, oftentimes called the New States Clause, and found at Article IV, Section 3, Clause 1, authorizes the Congress to admit new states into the United States beyond the thirteen already in existence at the time the Constitution went into effect.
Equal Protection Clause The Equal Protection Clause is part of the Fourteenth Amendment to the United States Constitution. The clause, which took effect in 1868, provides "nor shall any State [...] deny to any person within its jurisdiction the equal protection of the laws".