Yes, they will.
no. birds live in birdhouses
Yes, both bluebirds and sparrows are cavity nesters. This means they both use birdhouses to make nests in. Sparrows are very fierce and often when fighting with bluebirds they kill its babies or break their eggs.
Use soap.
Yes. They live in New York where the environment is suitable.
Grass, twigs and moss and other materials suitable for a nest.
In a tree
no
In a tree
By getting the necessary things needed to live.
Yes, they do.
Yes. They live in western Canada.
The eastern bluebird is found there.