Connect verb - To put or bring together so as to form a new and longer whole.
Usage example: connect all the sets of lights and attach them to the branches of the Christmas tree
Unite is a synonym for connect in link topic. In some cases you can use "Unite" instead a verb "Connect", when it comes to topics like joining, action, associate, assemble. popular alternative
Unite verb - To come together to form a single unit.
Usage example: using the microscope, we watched the water droplets unite into a single pool
Connect is a synonym for unite in combine topic. You can use "Connect" instead a verb "Unite", if it concerns topics such as joining, action, assemble, integrate. popular alternative
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Google Ngram Viewer shows how "connect" and "unite" have occurred on timeline