The acting head of the National Archives announced his resignation on Friday, paving the way for Donald Trump to continue his takeover of the government’s records and the agency that serves as custodian of the nation’s history. Deputy Archivist William Bosanko informed staff in an email Friday that he will step down on Tuesday. Bosanko, who has worked at the agency since 1993, has been the acting head of the National Archives and Records Administration for just a week, after Trump fired Archivist of the United States Colleen Shogan. Under federal law, a president can fire the archivist but must...