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Is a CMS Collection appropriate for Grid of accordion items

I’m creating a grid that would display geographic states, & then accordion open to reveal cities w/in the states as well as a link to a popup modal. This content works in my grid now, however the grid is no resizing responsively & deleting columns is leaving behind the nested content instead of responsively organizing it.

Should I be using a CMS collection for this Accordion content, or is their something else I can do so that my exisiting grid acts responsively?

Here is my public share link: [LINK][1]