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A collapsible wagon is adjustable between an expanded configuration and a collapsed configuration. The wagon comprises a frame, four wheels, and a pliable liner. The frame has a front wall, two side walls, and a rear tailgate. The walls and tailgate of the wagon are collapsible for storing the wagon

A collapsible wagon is adjustable between an expanded configuration and a collapsed configuration. The wagon comprises a frame, four wheels, and a pliable liner. The frame has a front wall, two side walls, and a rear tailgate. The walls and tailgate of the wagon are collapsible for storing the wagon.

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1. A wagon that is adjustable between an expanded configuration and a collapsed configuration, the wagon comprising: a frame, the frame having a front wall, two side walls, and a rear tailgate, each of the front wall, side walls, and the tailgate being formed by a respective scissor-bar assembly, th

1. A wagon that is adjustable between an expanded configuration and a collapsed configuration, the wagon comprising: a frame, the frame having a front wall, two side walls, and a rear tailgate, each of the front wall, side walls, and the tailgate being formed by a respective scissor-bar assembly, the frame also having a vertically oriented telescoping pole assembly at each intersection where the scissor-bar assembly of the front wall meets each of the side walls, the frame further having a vertical telescoping pole assembly connected to each rear end of the scissor-bar assemblies of the side walls and a telescoping poll assembly at each side end of the scissor-bar assembly of the tailgate, the tailgate and the telescoping polls attached thereto being pivotal from a substantially vertical orientation to a substantially horizontal orientation when the wagon is in the expanded configuration, the frame being such that as the wagon is altered from the wagon's expanded configuration to the wagon's collapsed configuration with the tailgate in its vertical orientation the scissor-bar assemblies and the telescoping pole assemblies increase in height and the scissor-bar assemblies decrease in width;four wheels, each being attached to a bottom end portion of a respective one of the telescoping pole assemblies; anda pliable liner that is connected to the frame and that defines an open-top interior compartment of the wagon when the wagon is in the wagon's expanded configuration. 2. The wagon in accordance with claim 1 comprising a telescoping tow handle, the telescoping tow handle being adjustable between collapsed and expanded configurations. 3. The wagon in accordance with claim 1 wherein each of two of the scissor-bar assemblies comprises a single pair of crossed bars and each of the other two of the scissor-bar assemblies comprises a plurality of pairs of crossed bars connected to each other. 4. The wagon in accordance with claim 1 wherein the wagon further comprises a collapsible bottom support assembly, the bottom support assembly comprises a central hub and four bars, the four bars are each pivotally connected to the central hub and to the bottom end portion of a respective one of the telescoping pole assemblies. 5. The wagon in accordance with claim 4 wherein the central hub allows each of the four bars of the bottom support assembly to pivot downward therefrom and prevents the four bars from pivoting upward therefrom beyond horizontal. 6. The wagon in accordance with claim 1 wherein the wagon is configured such that two of the wheels can only revolve about a fixed horizontal axis and the other wheels revolve about vertical axes and are able to rotate about a horizontal axis. 7. The wagon in accordance with claim 1 wherein the telescoping pole assembly connected to the rear end of the scissor-bar assembly of each of the side walls is connected by a fitting to a respective one of the telescoping pole assemblies of the tailgate. 8. The wagon in accordance with claim 7 wherein a brace member connects the telescoping pole assembly connected to the rear end of the scissor-bar assembly of each of the side walls to the respective one of the telescoping pole assemblies of the tailgate, and the brace members prevent the tailgate from pivoting downward beyond a limit. 9. The wagon in accordance with claim 1 wherein the wagon comprises selectively releasable straps that are configured to secure the tailgate in the substantially vertical orientation.