1. The Action of window.history.back()
When you use window.history.back() or the user clicks the browser's "Back" button, the browser itself changes the URL to return to the previous entry in its history. It expects the page to react to this URL change. In a SPA, this means that the Angular Router must detect this browser-initiated URL change and act accordingly.

2. Why the Page May Appear Blank: Routing Issues
One of the most common reasons for a "not loading" page is a problem with the routing configuration. If the Angular Router doesn't recognize the URL the browser has returned to, or if it is missing essential route parameters (e.g., an id in /products/:id), it won't know which component to display. The page may then remain blank or display a default/error component.

3. The Importance of Component State
Even if routing works, the previous component state isn't automatically restored. Imagine a half-filled form or a filtered data list. When you navigate back, the component is usually reset. If the logic for reloading the necessary data or restoring the previous state isn't properly implemented in the component's lifecycle hooks (such as ngOnInit), the component may appear empty or incomplete.