Let's start creating our app environment:

1. Create a new React app called cross-border using the following npx command: 

npx create-react-app cross-border

2. Update your package.json file so that it contains the following values:

{
 "name": "cross-border-app",
 "version": "1.0.0",
 "private": false,
 "dependencies": {
 "bulma-start": "0.0.2",
 "concat-stream": "^2.0.0",
 "fs": "0.0.1-security",
 "react": "^16.4.1",
 "react-dom": "^16.4.1",
 "react-scripts": "1.1.4",
 "stellar-sdk": "^3.0.0",
 },
 "scripts": {
 "start": "react-scripts start",
 "build": "react-scripts build",
 "test": "react-scripts test --env=jsdom",
 "eject": "react-scripts eject"
 }
}

3. Run npm install in a Terminal window to install the dependencies.
4. Finally, within the src folder, create a Components folder for the app components. 

Let's take a look at our USD.js.