which country do they belong to?
The United States of America
Wright brothers
The Wright brothers—Orville (August 19, 1871– January 30, 1948) and Wilbur (April 16, 1867– May 30, 1912)—were two American aviation pioneers generally credited with inventing, building, and flying the world's first successful motor-operated airplane. 
who is credited with performing the first heavier-than-air flight The Wright brothers—Orville  and Wilbur Wright where did they spend their childhood? They lived in twelve places before finally settling down in Dayton. when did they make their first aircraft? The brothers flew the glider in the early autumn of 1900.
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Wright brothers [SEP] Introduction
The Wright brothers—Orville (August 19, 1871– January 30, 1948) and Wilbur (April 16, 1867– May 30, 1912)—were two American aviation pioneers generally credited with inventing, building, and flying the world's first successful motor-operated airplane. They made the first controlled, sustained flight of a powered, heavier-than-air aircraft with the "Wright Flyer" on December 17, 1903, south of Kitty Hawk, North Carolina. In 1904–05, the brothers developed their flying machine to make longer-running and more aerodynamic flights with the Wright Flyer II, followed by the first truly practical fixed-wing aircraft, the Wright Flyer III. The Wright brothers were also the first to invent aircraft controls that made fixed-wing powered flight possible.