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An example: Was North America here before you were? Will it be here after you are gone? The answer to both is yes. So, we know North America exists outside of your (or anyone's) consciousness.
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It's an extreme example perhaps, but an existentialist would say that we cannot to an absolute certainty say that North America was here before we were born or will be here after we die. How could anyone convince me that everything I perceive might be a construction of my own mind. There is no one we will ever know as well as we know ourselves. Everyone else could be a delusion. Even my physical body could be a part of the delusion. Maybe I'm a huge, deformed brain sitting in a beaker in some other reality making all this up.
Would that be an unreasonable possibility?