Remember that a texture's loadFromFile returns
true if it loads successfully.
You're outputting "couldn't load" if it can actually load.
Does it output "blueBrick.png couldn't load"?
If it does, your texture is loading fine.
If it doesn't, your texture is failing and SFML should be outputting an error message.
If it's failing, it could be that its format is unsupported. You could try resaving it with only standard features.
So, in the future, remember you need to be testing for false when testing if something fails:
if (!t1.loadFromFile("C:/Users/Jackson Kidwell/Downloads/blueBrick.png"))
std::cout << "blueBrick.png couldn't load";
(note the "!" in "!t1")
Anyway, aside from that, I'm going to guess that your texture is loading perfectly as it looks like something else is enough to cause the issue.
You're not "displaying" the window so it'll never show you anything.
Remember: clear, draw, display.window.clear();
window.draw(sBackground);
window.display();