TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: THE EARLY 1900s 
Clue: These 2 nations fought a war on neither nation's soil; the decisive battle came at present-day Shen-Yang

SOLUTION: russia & japan

PROBLEM: Category: BRAND NAMES 
Clue: To feature its "Strong enough to stand on" product, in 1965 Shwayder Bros., Inc. changed its name to this

SOLUTION: samsonite luggage

PROBLEM: Category: SINGERS 
Clue: He first recorded in 1939, "retired" in 1971, returned & had a Top 10 album in 1993

SOLUTION:
frank sinatra