It is true that the US is trying monopolize the world's oil supply - they buy from sources in the Middle East, and yet when they find a source on their own land, they plug it up, and leave it 'for that rainy day'. Eventually they may become the sole largest supplier of crude.
The first is also true to an extent. Predictions about oil running out within 10 years were made ~40 years ago. However, as technology improves, undiscovered reserves can then be accessed, and thus stock seems to keep up with demand. This is of-course unsustainable, but there is undoubtedly more oil, which simply cannot be drilled with our current level of technology.