TUNIS, Tunisia - Thousands gathered Monday in Tunisia's capital as the country marked eight years since a democratic uprising ousted its long-time strongman. The rally came amid deepening economic troubles in the North African nation and resurgent anger at the revolution's unfulfilled promises. Unions, political parties and other civil society groups came together in Tunis to celebrate the 2011 revolution and keep up pressure on the government to improve economic opportunity in the impoverished nation. State workers who want an end to a salary freeze plan a general strike Thursday that could disrupt airports, ports and the Mediterranean nation's vital tourism industry. Union leader Mohamed Ali Boughdiri warned of possible violence, saying workers' "patience is running out." Tunisian President Beji Caid Essebsi opened an exhibit Monday on the revolution at the country's leading museum and urged all parties to work together to solve their differences. He summoned