Under Nicolas Maduro, a status quo prevailed among Venezuela’s powerful armed factions: Paramilitary cells enforced the government’s priorities. Ever-expanding crime syndicates, deep-pocketed prison gangs and combat-tested Colombian rebels often colluded with local officials or the federal government. But with Mr. Maduro gone, and allies and opponents competing to fill the power vacuum at Venezuela’s center, there are many forces — or breakaway groups within them — that could frustrate the ambitions of whoever governs the country. Photos by Juan Barreto/Agence France-Presse and Adriana Loureiro Fernandez/The New York Times For now, Delcy Rodríguez, a Maduro ally who led the stabilization of Venezuela’s economy after a harrowing crash, has emerged as the Trump administration’s choice to lead the country. Ms. Rodríguez, the administration determined, has a firmer grip than the political opposition on Venezuela’s many security forces and intelligence agencies, and their paramilitary offshoots. But the transition from Mr. Maduro’s authoritarian rule is just starting. The huge investments Venezuela will need to revive its vital oil industry, and the broader economy, require at least a semblance of stability. …