The legalization chain, in order
For a private document (a power of attorney, an affidavit of single status, a company resolution), the order is fixed. The notary acts first. If the state routes commissions through counties, the county clerk certifies the notary. The Secretary of State certifies the county clerk or the notary, depending on the state. The U.S. Department of State certifies the Secretary of State. The embassy certifies the Department of State. Skip a rung and the next office returns the packet.
Public records behave differently. A birth certificate, a court order, or a school transcript is not notarized at all; you start with a certified copy from the issuing office, and that office's registrar signature is what gets certified up the chain.
