leaflet-choropleth | Choropleth plugin for Leaflet | Dataset library

I am attempting to sort a feature collection inside a geojson based off a property and then slice the first 5 features based on that geojson. With help from some people here I've got the basic sort and slice set up, but I noticed that when I return the final result from sorting and slicing my geojson, the final result is not a geojson but just the subset from the specific array inside the geojson.

How would I alter my code so that I retain the original geojson architecture but with only those top 5 sorted features? The purpose being to map the smaller sorted geojson result. I have a coded example here:

https://codesandbox.io/s/slicing-geojson-qg1hb?file=/src/App.js

With the "Original geojson" and "final result" printing in the console.

Here is what I am getting before and after the filter:

Before filter:

I am trying to map out a geojson that I am fetching in react and using react-leaflet. I am able to map the geojson when I import it locally. Now I am fetching the raw data via https and then setting state to try to pass that state as props. But nothing maps from this.state.geojson.

I think I might be setting state wrong or misunderstanding how the rendering works. Some guidance would be appreciated. Below is some of the code:

App.js

I am trying to access a raw geojson via a fetch call and store it in state. This is just temporary not a production scale application. I'm unsure where i am going wrong though. My code is below:

I am attempting to make a choropleth in react using react-leaflet-choropleth.

I have leaflet working fine.
Now when I try to load a geojson (crimes_by_district) using the library I am getting an error when mapping through the features, specifically:

I am trying to create a choropleth that shades states depending on the rate of cases in 2010. I am getting the error: Uncaught TypeError: Cannot read property 'features' of null at Object.t.choropleth.n.exports [as choropleth]. Is this a problem with reading and extracting the data from the geojson?