You cannot wire multiple USB devices to one set of wires, it will NOT work. All USB hubs require a chip that does the protocol translation from one to multi ports. If you try to connect multiple things to one port they will conflict with each other and additionally draw too much power on the lines and cause the port to be shut down. Fortunately the USB ports are smart enough to shut down the power before burning things out.
All USB end points are single device endpoints (although they may have multiple logical endpoints). This means that from the port to the device is only one physical connection. Hubs have a special protocol that makes them "transparent" to the host and allows for passing of data between multiple devices. Thus you MUST use a USB hub to get more USB ports.
I'm glad to see that the monitor has more ports for you, and thus you've solved your problem. But just want to make it clear for everyone, don't try wiring multiple things to one USB port.