Question: I want hanging paragraphs throughout my document. I tried the following:

```
\documentclass{amsart}

\usepackage{hanging}
\usepackage{lipsum}

\begin{document}\begin{hangparas}{15pt}{1}

\lipsum[1-3]

\begin{itemize}
    \item Something
    \item Something else
\end{itemize}

\lipsum[4-6]

\end{hangparas}\end{document}

```

But the paragraphs after the itemize environment fail to have the indentation pattern I wanted. Of course, I realize I could just start and stop the hanging indent every time I use another environment, but that would be rather annoying. So solutions that *don't* suggest doing that would be preferred. Ideally, I'd like to just put a single command in the preamble that impacts all the paragraphs in the document, but which still lets me use the itemize environment.

Answer: 
When you use TeX primitive solution of hanging paragraphs, i. e. positive `\leftskip` and negative `\parindent` then your problem does not occur. 

```
\documentclass{amsart}

\usepackage{lipsum}

\begin{document}

\leftskip=15pt \parindent=-\leftskip

\lipsum[1-3]

\begin{itemize}
    \item Something
    \item Something else
\end{itemize}

\lipsum[4-6]

\end{document}

```
You just have to put your environment in a group. You can have it in a stroke for all itemize environments with `etoolbox`:

```
\documentclass{amsart}

\usepackage{hanging}
\usepackage{lipsum}
\usepackage{enumitem}
\usepackage{etoolbox}
\BeforeBeginEnvironment{itemize}{\bgroup}
\AfterEndEnvironment{itemize}{\egroup}
\begin{document}

\begin{hangparas}{15pt}{1}
\lipsum[1-3]

\begin{itemize}
    \item Something
    \item Something else
\end{itemize}%

\lipsum[4-6]

 \end{hangparas}

```

[![enter image description here](https://i.stack.imgur.com/HpNU9.png)](https://i.stack.imgur.com/HpNU9.png)
 \end{document}