Portland-class heavy cruiser

generate a one-sentence description for a given conceptual class.
# Response Format
Return only the sentence: "Description: [one-sentence description of the conceptional class]"

Class: Portland-class heavy cruiser

The Portland-class heavy cruiser was a class of U.S. Navy warships built in the early 1930s, designed under interwar treaty limitations to provide long-range, heavily armed surface combatants that balanced protection, speed, and firepower for fleet screening and offensive operations.