If any of these were true, then everyone in that community, job, relationship, etc. would be stressed. Maybe most are. But some are not. Most are effective. Most stress is internal, caused by the ways in which we relate to the world and events and people around ourselves.
Stress is caused when there is a disconnect between our expectation and our reality.
When reality falls short of an expectation, it creates a disappointment and that causes stress. You probably have an expectation that your car will be right where you left it when you got to the parking lot this afternoon. You insert the key and drive away. No, because expectation and reality match up. While most of us will experience those larger disappointments in life, they are typically few and far between so that our bodies have a chance to cope and recover.