CAIRO—Egyptians took to the streets on Wednesday to mark the one-year anniversary of the uprising that ended Hosni Mubarak's 30-year dictatorship, amid deepening concern that bitter political divisions and a troubled economy have deflated Egypt's once heady revolutionary hopes.

Hundreds of thousands joined rallies in cities across the country. In Cairo, processions clogged the streets, wending their way from every corner of the sprawling capital toward the city's central Tahrir Square, the cradle of January's uprising. Some jubilantly celebrated the revolution. Others angrily denounced the continuation of military rule.

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