Because you're not a dual citizen, and it doesn't seem like you are working in the TAL list (see below).
PS. You barely arrived in Canada, and already leaving to the US so quickly. Seems like you saw the light
Technology Alert List
i. Conventional Munitions;
ii. Nuclear Technology, Physics, and Engineering;
iii. Rocket Systems and Unmanned Air Vehicle;
iv. Navigation, Avionics and Flight Control;
v. Chemical, Biotechnology and Biomedical Engineering;
vi. Remote Sensing, Imaging and Reconnaissance;
vii. Advanced Computer/Microelectronic Technology;
viii. Materials Technology;
ix. Information Security;
x. Laser and Directed Energy Systems Technology;
xi. Sensors and Sensor Technology;
xii. Marine Technology; and
xiii. Robotics Urban Planning