; and (5) all laws of the United States reserving to the United States the free use or enjoyment of property that vests in or is conveyed to the State of Puerto Rico or political subdivisions of the State of Puerto Rico pursuant to this section or reserving the right to alter, amend, or repeal laws relating to the property shall cease to be effective. 409. Judicial pronouncements (a) Pending A writ, action, indictment, cause, or proceeding pending in any court of the Commonwealth of Puerto Rico as of the admission date— (1) shall not abate by reason of the admission of the State of Puerto Rico into the Union of the United States; but (2) shall, as the nature of the case may require— (A) proceed within any appropriate State court established under the constitution of the State of Puerto Rico; or (B) continue in the United States District Court for the District of Puerto Rico. (b) Not yet pending (1) In general Any civil cause of action or criminal offense that arose or was committed before the admission date, but with respect to which no writ, action, indictment, or proceeding is pending on the admission date, shall be subject to prosecution in the appropriate State court or in the United States District Court for the District of Puerto Rico, to the same extent, and with the same right of appellate review, as if the State court had been established before the accrual of the cause of action or the commission of the offense. (2) Procedural or substantive laws (A) In general The admission of the State of Puerto Rico into the Union of the United States shall not affect a change in the procedural or substantive laws with respect to a cause of action or criminal offense that arose or was committed as of the admission date. (B) Trial Any criminal offense described in subparagraph (A)— (i) that was committed in violation of the laws of the Commonwealth of Puerto Rico shall be tried by the appropriate court of the State of Puerto Rico